Telegraph system.



G, A. UANELSON ELEGR/PH SYSEM. APPLICATION ,FILED MAY?. 1917.'

wanted Am. w, 1918.

i wel? for: A 05am/. Dan/'e man.

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TELEGRAH SYSTEM.

Application filed Hay 2, 1917.

To aZZ whom t may concern:

Be it known that l', @scan A. DANinLsoN, a citizen of the United States,residing at Plainfield, in the county of Union and State of New Jersey,have invented certain new and useful improvements in Telegraph Systems,oi which the following is a `full, clear, concise, and Aexactdescription.

This invention relates to telegraph systems and more particularly toimprovements in systems for the repeating, of telegraph signals orelectrical impulses from one line circuit section into another linecircuit section, these repeating,` operations taking place automaticallyand in either direction. On long telegraph lines the resistance of theline and the leakage, due to low insulation resistance, often limit thelength of line that can be served efficiently oy a single E. M. F., andit, therefore, becomes advisable to divide the total length of line intoseparate sections, using separate batteries for diiierent sections andrepeating the messages automatically from one section to another.

It is the object of the present invention to provide a simplied and anef'dcient arrangement of apparatus, suitable 'for repeating telegraphiesignals or electrical 'impulses automatically from one section` toanother and operable in either direction. A Jfurther object is toprovide apparatus which is not only economical because 'of the low costof manufacture, but also apparatus, the main-I tenance of which is nothigh and does .not require expert service. To accomplish 'these resultsthe equipment provided comprises vfour relays of uniform standard typeequipped with 'front and back' Contact springs, two of these relaysbeing arranged to respond only to impulses of positive polarity, whilethe other two relays respond only to impulses of negative polarity'.Associated with the front contacts ot these relays are two groundedbatteries of opposite polarity, so arranged in the circuit as to malleit possible to send out on one section of the line a strong impulseidentical in character with the impulse received from the other sectionof 'the line. l

Theobject ot this invention may be more clearly understood by referenceto the aom companying" drawing which shows diagram niatically thearrangement of apparatus proposed for repeating signals between theSpecification of Letters Patent.

Serial No. 165,@22.

line sections L1 and L2. The relays used in this equipment arepreferably of the stand Patented Apr, lit, lQl.

ard polarized type adapted to respond to current impulses of onepolarity only.. ,Ref lays l and 3 are adapted to -respond only toimpulses of positive polarity, while relays 2 and l respond only toimpulses of',

negative polarity. The linol L1 is connected. through the windings ofrelays l andI 12, which are joined in parallel, and thence to groundthrough the back contacts of re lays 3 and 4., ln a corresponding mannerthe 3 and 4lin parallel and thence to ground throufrh the hack contactsof relays 1 and, 2. 'Elle front contacts of relays l and '3.,

`line L2 is connected to the windingso relays which respond to positivepulsations, are]` connected through a protective resistance r 5 to thepositive terminal of the repeater,`

battery G, the negative terminal of this-batfy tery being connected toground. Simultane,` ously, the front contacts of relays 2 and'll,

which respond only to negative pulsations, l

are connected through the protective re' sistance 7 to the negativeterminal of the battery S, the positive terminal of this battery beinggrounded.

To more clearly understand the operation ot' the apparatus, let it beassumed that telegraphic signals are being sent over line L1 and itdesired that they be repeated over the line L2. These current impulsespass through the windings of relays 1 and 2 in parallel, and thence toground through the back contact and armature' 9 of relay 3 and the hackcontact and armature l() of relay ll. li? this current pulsation is ofpositive polarity relay 2 remains unoperated but relay l operates, andin so doing connectsv the repeater battery' 6, which is of the samepolarity as i the energizing pulsation., through the trent Contact andarmature 11 of relay i 'to the line section L2. AS the relay i operatesthe circuit through its back: contact and armature l2 is opened, therebyeliminating,I any possibility oficonfusing impulses being received overthe line L2 througll theback contacts of relays'l and the repeaterbattery through the back conn lli() sation over line section L1 is ,l`While relay 2 iunetlons, connecting tacts of this relay. Assuming that,v

ve in ti character, relay 1 then remains iinope, the re es t peaterbattery 7 of the saine polarity energizing pulsatio'n to the linesection-4 if through the front contact and arnistnre i5 .of the relay 2.Theoperstion. of this relay opens the circuit from line L2 4to groundits themovernent of armature i4 l. way :from contact.

'The operation of this` apparatus in re 'from its back Contact andconnecting;

' crdsa very simple spense to current pulsations entering on line L2 -isidentical with. that jfnst eiescrilced for pulsations entering over lineif. 'i". e

current pulsations lness through the 'Win rigs of relays 3 Aand t 1nparallel and thence to ground through the back Contact sind sr-ine ture12 or" relay l and the back Contact met armature 1&1. of relay 2. A.pulsetion ci peer tive polarity causes only relay 3 to oit: therebybreaking the circuit from L1 ground. by the movement of armature erfrepeater battery 6 of positive poiarity to if, through the front Contactand armature l5.

Similarl in res onse to a nefrative nulsation entering over line L onlyrelay eperates. The operation oi this resy bresil@ the connectionbetween line l1# groene?. iiy the opening oi the circuit at the iss-clicon- -tect and armature 10 and connecte repeateribattery 8 to L1tlirougi tile con-- tact and armature 16 or rele-y 4t .From theforegoing it will is .y the proposed. arrangement of Anient for'tbeautomatic reps l impulses from one lsection oi i ther, and in eitherdirection.

System illustrated anni ciescribe is arrange-ifi reiity of lines, gtWoinversely rc isys for each Eine, means controlled, by' each reisy ofeach line to disable the other line, and ineens controlled by each relayci each line to repeat signcis from the respectively associated lineinto the other line.

.in s signaling' system, sources ot curl uliirality ci line sections anda pair ci' relays for each one oi" saisL line sections for regeetngcurrent impulses into another one ci' said line sections, the relays ineach ort' seid sectie-ns being under the control of eitiier one of therelays in seid other section.

vin a signaling syst-ein, a plurality oi' li sectie., s e pair of relaystor each of seid line sections il'or repeating current impulses into theother line section, the reieys in each said sections being under thecontrol or" es in another section, one of said relays section beingresponsive only to curfulses of ypositive polarity, 'the other Lelays i"eacli section being responsive to onrre .inpnlses of negative polarity,a source or current of positive lco' rity controlled by seid relaysresponsive 'to positive ent inip'uises, and a source of current of "Hivepolarity oni-,rolled lby ssicl'relays responsive te egntive currentimpulses. v in. sig'aling system, :i line circuit cliyidccl intosections, sources of current of opposite polarity, anni electromagneticclevices associated 'with each section and selec tiveiy respcnsiye 'tothe current impulses of ami connect W section the of current lievi? iilefty corresponding to that ci the seiec 'ng impulse, said eieotrorf"'g'netic devices in each oi said sections ioe-s under 'ti 'i control oflie electromagnetic es another section,

ph system ofthe class Where- A :ensniitteci by moons of eur imi/ingdifferent characteristics, a Erst enel second line section, 'two Jiaysinvepsely ve to said aling currents for each n nies, and. meanscontrolled bv inverse 'ation tlieltwc relays of each :rpiccei y actingto disable the other line to Jt signals thereinto. i "whereof, lhereunto suliseribe itil?.

JUMSI bible me tactil dey of Aprii Lw fi.. gli.

' rent polarity over that section to seiect .Sine for A Bullit

